201265266161 has 4 divisors (see below), whose sum is σ = 201281508324. Its totient is φ = 201249024000.

The previous prime is 201265266131. The next prime is 201265266211. The reversal of 201265266161 is 161662562102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31320150625 + 169945115536 = 176975^2 + 412244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201265266161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201265266101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8102480 + ... + 8127281.

It is an arithmetic number, because the mean of its divisors is an integer number (50320377081).

Almost surely, 2^201265266161 is an apocalyptic number.

It is an amenable number.

201265266161 is a deficient number, since it is larger than the sum of its proper divisors (16242163).

201265266161 is a wasteful number, since it uses less digits than its factorization.

201265266161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16242162.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 201265266161 in words is "two hundred one billion, two hundred sixty-five million, two hundred sixty-six thousand, one hundred sixty-one".